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In other words, when the compiler starts building your code, no #define statements or anything like that is left In the normal c or c++ build process the first thing that happens is that the preprocessor runs, the preprocessor looks though the source files for preprocessor directives like #define or #include and then performs simple operations with them. A good way to understand what the preprocessor does to your code is to get hold of the preprocessed output and look at it.
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As far as i know, what you're trying to do (use if statement and then return a value from a macro) isn't possible in iso c.but it is somewhat possible with statement expressions (gnu extension) 0 in c or c++ #define allows you to create preprocessor macros I've found that this works on gcc and clang by default:
What is the point of #define in c++
I've only seen examples where it's used in place of a magic number but i don't see the point in just giving that value to a variable instead. How can i use #if inside #define in the c preprocessor Asked 15 years, 6 months ago modified 7 months ago viewed 51k times The #define directive is a preprocessor directive
The preprocessor replaces those macros by their body before the compiler even sees it Think of it as an automatic search and replace of your source code A const variable declaration declares an actual variable in the language, which you can use.well, like a real variable Take its address, pass it around, use it, cast/convert it, etc
So i read the interesting answers about what are the differences between constexpr and const but i was curious about are the differences between #define and constexpr
I feel like constexpr is jus. Pero en una forma más compleja, #define admite parámetros que pueden formar parte de la sutitución resultante Eso permite usarlo para escribir una especie de funciones, que en realidad no son funciones porque el preprocesador se ocupa de expandir su uso (es decir, reemplazarlo por su correspondiente sustitución poniendo los parámetros donde corresponda) Por ejemplo si en tu código.
The question is if users can define new macros in a macro, not if they can use macros in macros. #define width 10 is a preprocessor directive that allows you to specify a name (width) and its replacement text (10) The preprocessor parses the source file and each occurrence of the name is replaced by its associated text The compiler never actually sees a macro name at all, what it sees is the replaced text.
